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The Test Set by Posit

Posit, PBC
Data Science
Python
Open Source
Artificial Intelligence
Pandas
Apache Arrow
Narwhals
Positron
Posit
Large Language Models
Polars
Tidyverse
Environmental Health
DBT
Hex
Ibis
Statistical Analysis
Duckdb
Education
Solutions Engineering

A Posit podcast for data science junkies, anomaly hunters, and those who play outside the confidence interval. Hosted by Michael Chow, with co-hosts Wes McKinney & Hadley Wickham.

PublishesTwice monthlyEpisodes29Foundeda year ago
Number of ListenersCategory
Technology

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Artwork for The Test Set by Posit

Latest Episodes

Ruth Milligan has coached hundreds of conference speakers, curates TEDx Columbus, and wrote The Motivated Speaker. She's here to tell you that speaking is habitual, not natural. Michael, Wes, and Hadley get a live fifteen-second filler word hack, an ... more

YouTube

Trevor Manz went from measuring plant apertures by hand in a wet lab to building the notebook that lets coding agents take the wheel. The creator of anywidget and founding engineer at marimo (marimo.io/pair) popped into The Test Set to spill on react... more

YouTube

Leilani Battle studies how software shapes what we see and believe. The University of Washington professor and co-director of the UW Interactive Data Lab talks with Michael, Hadley, and Wes about an experiment that manipulated people using nothing bu... more

YouTube

Joe Cheng is the CTO of Posit and the creator of Shiny. He joins Michael and Hadley to talk about why he almost walked away from AI work entirely over ethics concerns and what it takes to lead a team that didn't necessarily choose you. Plus, why sayi... more

YouTube

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Recent Guests

Caitlin Colgrove
CTO and co-founder of Hex
Hex
Episode: Confidently Incorrect — with Caitlin Colgrove
Alex Hillman
Author of The Tiny MBA; co-founder of Indie Hall and Stacking the Bricks
Indie Hall / Stacking the Bricks
Episode: The Bothness of It — with Alex Hillman
Mike Bostock
Creator of D3, founder of Observable
Observable
Episode: The Code Doesn't Lie — with Mike Bostock
Vincent Warmerdam
First full-time hire at Marimo, founder of comcode.io
Marimo; comcode.io
Episode: Widgets Are Lego Bricks (and Other Things People Are Sleeping On) — with Vincent Warmerdam
Benn Stancil
Writer and former Mode data leader
Substack, Mode
Episode: Everything's a Fad (Including This Podcast) — with Benn Stancil
Tristan Handy
CEO of dbt Labs
dbt Labs
Episode: Deeply Unsexy: SQL's Redemption Arc — with Tristan Handy
Nell Thomas
Vice President of Data at Shopify
Shopify
Episode: Your VP Is Doing a Rogue Analysis in Cursor Right Now — with Nell Thomas
Philip Cloud
Principal software engineer at Nvidia; lead on the Ibis project; early Pandas contributor
Nvidia
Episode: Sleeping Rats and Sociopathic Agents — with Phillip Cloud
Charlie Marsh
Founder and CEO of Astral, developer of tools for Python
Astral
Episode: More productive but a lot less fun — with Charlie Marsh

Hosts

Michael Chow
Host of The Test Set; long-running Posit software engineer and leader.
Hadley Wickham
Co-host/Chief Scientist at Posit with extensive contributions to data science tooling and open-source projects.
Wes McKinney
Co-host and Principal Architect; key figure behind major data tooling efforts.

Chart Rankings

How this podcast ranks in the Apple Podcasts, Spotify and YouTube charts.

Apple Podcasts
#134
India/Technology

Talking Points

Recent interactions between the hosts and their guests.

The Bothness of It — with Alex Hillman
Q: How do you explain your approach to marketing to open-source communities?
Focus on earning trust and aligning incentives with the community, rather than traditional sales tactics; emphasize transparency and mutual benefit over manipulation.
Sleeping Rats and Sociopathic Agents — with Phillip Cloud
Q: What are your thoughts on the most exciting development for developers today, especially regarding AI and productivity?
He reflects that AI is intriguing but not the sole driver; the key is developer productivity and the way AI changes how we measure and improve it, along with how tools like VS Code and modern CLIs have reshaped workflows.
Sleeping Rats and Sociopathic Agents — with Phillip Cloud
Q: Catch us up on your path into open source tools like Ibis and your broader background.
Philip describes a long arc from Matlab/ LabVIEW experiences in mixed-discipline labs to Python-based data tooling, and eventually contributing to Pandas and driving Ibis; his focus has always been practical data analysis workflows and expanding the reach of open-source projects.
More productive but a lot less fun — with Charlie Marsh
Q: What excites you for the future?
Charlie is optimistic about the changes in software development and standards around package management.
More productive but a lot less fun — with Charlie Marsh
Q: What is UV?
UV is an all-in-one Python packaging binary that installs Python, manages installations, creates virtual environments, and resolves dependencies.

Audience Metrics

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Frequently Asked Questions About The Test Set by Posit

What is The Test Set by Posit about and what kind of topics does it cover?

Across episodes, the show centers on data tooling, open-source ecosystems, and the practical realities of building data products in modern organizations. Conversations often explore how notebooks, AI assistants, and governance-friendly workflows reshape collaboration between data teams and non-technical stakeholders, with deep dives into visualization tooling, analytics engineering, SQL-centric tooling, and the evolving roles of data leaders. Notable throughlines include the tension between rapid AI-enabled experimentation and rigorous data quality, the role of community and open source in shaping tooling, and real-world case studies—from enterprise dashboards to Python and notebook ecosystems—demonstrating how data culture is evolving in l... more

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1. R Weekly Highlights
2. The Real Python Podcast
3. Practical AI
4. Talk Python To Me
5. Machine Learning Street Talk (MLST)

How many episodes of The Test Set by Posit are there?

The Test Set by Posit launched a year ago and published 29 episodes to date. You can find more information about this podcast including rankings, audience demographics and engagement in our podcast database.

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What guests have appeared on The Test Set by Posit?

Recent guests on The Test Set by Posit include:

1. Caitlin Colgrove
2. Alex Hillman
3. Mike Bostock
4. Vincent Warmerdam
5. Benn Stancil
6. Tristan Handy
7. Nell Thomas
8. Philip Cloud

To view more recent guests and their details, simply upgrade your Rephonic account. You'll also get access to a typical guest profile to help you decide if the show is worth pitching.

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